package com.ciei.dpagm.util;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;

/**
 * @author kiho
 * @date 2019/12/24 15:55
 **/
@Component
public class ApplicationContextHolder implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext arg) throws BeansException {
        applicationContext = arg;
    }

    //获取applicationContext
    public static ApplicationContext getApplicationContext(){
        if(applicationContext == null){
            throw new IllegalStateException();
        }
        return applicationContext;
    }

    //通过name获取 Bean.
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    //通过class获取Bean.
    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

    //通过name,以及Clazz 返回指定的Bean
    public static <T> T getBean(String name,Class<T> clazz){
        return getApplicationContext().getBean(name, clazz);
    }

    public static void cleanHolder() {
        applicationContext = null;
    }

    public static Environment getEnvironment() {
        return getBean(Environment.class);
    }
}
